(;AB[ab]AB[bb]AB[db]AB[cb]AW[aa]AW[ca]AW[bc]AW[cc]AW[dc]AW[ec]AW[eb]AP[goproblems]
(;B[da]C[White cannot play at B19 so Black has 2 eyes.RIGHT]MA[ba])
(;B[ea];W[da]
(;B[ba];W[da]C[Just one eye.])
(;B[fa];W[gb]C[Black cannot escape. If Black captures White throws in at D1 and Black has just one eye.]MA[da]))
(;B[ba];W[da];B[ea];W[da]C[Just one eye.]))